省to的動詞不定式

字號:

1) 情態(tài)動詞 ( 除ought 外,ought to):
    2) 使役動詞 let, have, make:
    3) 感官動詞 see, watch, look at, notice , observe, hear, listen to, smell, feel, find 等后作賓補(bǔ),省略to。
    注意:在被動語態(tài)中則to 不能省掉。
     I saw him dance.
    =He was seen to dance.
     The boss made them work the whole night.
    =They were made to work the whole night.
    4) would rather,had better:
    5) Why… / why not…:
    6) help 可帶to,也可不帶to, help sb (to) do sth:
    7) but和except:but前是動詞do時(shí),后面出現(xiàn)的動詞用不帶to的動詞不定式。
    8) 由and, or和than連接的兩個(gè)不定式,第二個(gè)to 可以省去:
    9) 通常在discover, imagine, suppose, think, understand等詞后,可以省去to be: 
     He is supposed (to be) nice. 他應(yīng)該是個(gè)好人。
    舉例:
     He wants to move to France and marry the girl.
    He wants to do nothing but go out.
    比較:  He wants to do nothing but go out.
      He wants to believe anything but to take the medicine.
    典型例題
    1) ---- I usually go there by train. 
     ---- Why not ___ by boat for a change? 
    A. to try going  B. trying to go  C. to try and go  D. try going  
    答案:D. why not 后面接不帶to 的不定式,因此選D。
    2) Paul doesn't have to be made ___. He always works hard. 
     A. learn  B. to learn  C. learned  D. learning
     答案:B. make后接不帶to 的動詞不定式,當(dāng)其用于被動時(shí),to 不可省略。